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after delivery changes to the aircraft. Of concern are the various
interior changes done by many carriers that move galley and
lavatories throughout the cabin. With these interior changes, location
of wiring, potable water, and waste water lines are changing. I
presently see no guidance coming that instructs when to use heat
shields/drip shields when an electrical disconnect panel is now too
close to the rerouted plumbing components.
OWNER REMARKS: OEM P3
The use of general and detailed visual inspections of wiring installed
in airplanes remains the preferred method of detecting actual or the
8 April 19 2002 33
potential for damage to wiring. This preference accounts for the
present level of diagnostic equipment available to the industry, the
needs of the industry, and the potential for undetected damage to
result in failure. The OEMs vehemently disagree that this preference
is either negligent or wrong given the present options. However, as
stated previously, the OEMs continue to consider NDT methods
other than visual inspections as a method of identifying actual or
potential wiring faults.
In addition, the OEMs expect that the enhanced zonal analysis
process (EZAP) will likely both determine whether general or
detailed visual inspections are sufficient, and will likely result in
identification of post-delivery wiring installations and specify any
resultant wiring inspections.
With regard to the comment regarding wiring protection, as with any
component installed on the airplane, except as cited within the
Configuration Deviation List contained within the Dispatch
Deviations Procedures Guide, protective shields are required to be
installed on the airplane during revenue service. It is the
responsibility of each operator to ensure that the design integrity of
the airframe is properly maintained and to incorporate maintenance
and inspection programs that follow industry best maintenance
practices. Operators should use the guidance provided in the
forthcoming wiring inspection programs, coupled with the guidance
contained within the OEM standard wiring practices documents to
either identify damage caused from missing drip or heat shields, or
identify the conditions that would necessitate protection.
The OEM’s believe that, although there exists the possibility that
some protection may have been inadvertently omitted on airlines
undergoing extensive modification, we believe that the existing
maintenance procedures in place at the airlines would dictate that
such omissions would be rare. We also believe that the effects of
such an omission would be minor in scope but still recognizable
through normal or enhanced maintenance activities.
Finally, with regard to the comment concerning the installation of
post-delivery modifications, OEM design practices, and the resulting
guidance used to maintain those designs, are proprietary to the OEM.
The requirement to use these practices and procedures for designs
created by entities other than the OEM is inappropriate. Operators,
repair houses and STC applicants could consult the OEM guidelines
in developing their after-delivery modifications, or develop their
own, but they are cautioned that the ESWPM is not intended as a
design standard but, rather, for use in maintenance and repair of the
OEM wiring installations.
As far as post-delivery modifications are concerned, Airbus is
currently reviewing the ESPM content related to wire routing and
segregation and will include in the ESPM guidance and
recommendations in case of new wiring installation after delivery to
the aircraft.
2d3 OEM Review design practices regarding the use of drip guards. Investigate
use of nondestructive testing to trouble-shoot suspect wire
installations
Boeing - Moisture ingression prevention guidelines are specified in
the SWPM and are commonly used during the production of new
airplanes. Detailed visual inspection is the preferred NDT inspection
8 April 19 2002 34
method to identify the presence of or indications of moisture
ingression
Airbus - Moisture ingression prevention is presently taken into
consideration during the design of the electrical system. Airbus will
include in the ESPM guidance and practices to maintain the design
provisions for the prevention of moisture contamination to wiring
Lockheed - The Lockheed SWPM manual provides practices specific
to SWAMP locations. Detailed Visual Inspection is the suggested
inspection method for detecting moisture ingression. Drip shields are
used throughout the SWAMP areas exclusively for the protection of
wiring. It is the responsibility of the operator to ensure the design
　
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